Adapter for rotary cloth cutting machine blades



W. AARON Nov. 16, 1943.

ADAPTER FOR ROTARY CLOTH CUTTING MACHINE BLADES Filed June 22, 1945 INVENTOR.

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Patented Nov. 16, 1943 I Foa ROTARYCVLOTH CUTTING MACHINEBLADES r i '5 f ADAPTER vvmi l' Aaron, Brooklyn, N. Y.

7 -;.Application June 22, 1943, Serial No 491L775:

50mi s; 01. 3 -347) This invention relates to 'cloth-cutting machines. of the rotary-blade type; and the invention'has reference to a novel construction of adapter for mounting discarded worn blades of relatively large size machines in smaller size ma- ,Cloth-cu tting machinesliof the rotary blade type are furnished in several ,sizes'each taking chines, thereby o-prolong the useful life of the 7 blades. v

cloth-cuttingmachines of the rotary blade type comprise a base having an upstanding stand ard,-a motor and bladedriving means actuated by the motor; The blade-in such machine comprisesa circular steel disk having an inner flat face andan outer beveled face; the periphery of the blade being sharpened to form "a cutting edge. The blade body is usually provided witha nonsymmetrical hub receiving aperture, which corresponds in size and peripheral shape to a like Iron-symmetrical blade -mounting hub of the blade driving means of the machine. Such hub projects fromthe face of the achine standard, whereby,when operatively mounted on the hub, the blade is rotated in a vertical plane, parallel to the face ofsaidfma'chine' standard, with the a blade of respectively different initially maxi mum given. diameter-ye. g. some machines are sized "to use a seveninch blade, others sized to use a six inch blade, still;,others sized to use 'a five inch blade; and even :machinesare sized to use other initial diameters, of; blades. H Most industries makinguseof rotaryblade cloth-cutting machines commonlygemploy,seyeraldifferent sizes of machines. Since each size of: machine, particularly as to standard, base and blade mounting hub, are shaped and sized proportionately for accommodation of only a given diameter of blade, andsince each size ofblade possesses adifferent size of hub'receiving aperture proportionate to its ,initial' diameter, although usually of ,thesame peripheral shape, it follows that the wornand discarded blade of a larger size of machine cannot" be applied to a smaller size of machine notwithstanding. that itmay be of a diametric size otherwise suitable lower part 'ofthe blade cutting edge portion extending through a slotted throat 'on'the machine base. The vmatching non-symmetrical blade opening and mounting. hub are so shaped, that the blade can only be mounted in a proper relation' tothe standard face; i. .e. with the flat side of the blade inwardand closely adjacent to the standard' face and the beveled side ofthe blade outward, whereby thefiat' side of the blade-lies very close to the standard face; with such limited clearance that entrance of my cloth, undergoing the cutting operation, between standard is prevented.

In the useof, the machine, the rotated blade is generally required to out its way throughmany :the blade and plies of cloth piled one upon another, and conse- L,

quentlythe blade cutting edge eventually becomes 1 dull and requires to be sharpened again to assure be sharpened from time to time, asnecessitymay By reason of. more a or less' frequent,

require.

sharpening of the blade, the same is graduallyreduced in diameter until eventually its cutting edge no longer sufficiently enters) the throat of the machine base to assure proper cutting ac-' tion, and consequently the blade mustbe removed, discarded and replaced by a new blade of initial ly maximum diameter."

for use in the latter. By reason of this;-worn and discarded blades mustube thrown away,and v their content of valuable high quality and comparatively costly steel becomeswaste and is lost;

a circumstance highly undesirable and wasteful at any time, but especially, so in times of scarcity requiring careful conservation and full use of valuable material,- such as exists, particularly, in

a time of War. 7 V

I-Iavingthese things in mind, it is an object of this invention to provide anovel means for application within the hub embracing aperture of "a worn blade incapable of further use in a relative- 1y large sizecloth-cutting machine, whereby such blade is adapted to ,beoperatively mounted in hub embracing relation to the driving hub of a smaller size 7 of,machine for use in the latter, thereby greatly prolonging the usefullife of such blade, with consequent conservation or; prevention'lof waste of valuablesteel or other material from which the blade is made.

' This invention has fora further object to pro vide an adapter. in the form of a perforate disk of rigid material, having a nonsymmetrical external pe'ripheral shape corresponding to and adapted to non-rotatably fit within the driving hub embracing aperture of a -rotary.blaole from a relatively large size cloth-cutting machine, and a non-symmetrical internal peripheral shape corv responding to and adapted to non rotatablyembrace a driving hjubof a smaller'size of cloth cutting machineQ v V Other objects" of this invention, not at this from a relatively large size of cloth-cutting machine, to which is operatively applied the adapter shown in'Fig. 2; and Fig. 4 is a sectional, View; taken on line 44 in Fig. 3, but showing the ap*-' plied adapter in edge elevation.

Fig. 5 is a fragmentary sectional I a base, standard, and driving meansof acompa-ratively small size cloth-cutting machine, uponthe' driving hub of which-is mounted the adapter edi'iippe'dblade of Fig. 3; said blade and adapter beingsnown in; section; with said-driving hub shown in'elev'aticnz As illustrated in Fig '1, which shows conventional fofm; of cloth-cutting maehme of the ro-'- tar y' blade type, the machine comprises a suppor tirig' -base-l *having a Suitably Shaped up standing standard-M, which carries at its upper endan eiectriedriving motor l2} Driven by the motor" [-2 by means: of suitable transmission means; including eJg-l the" bevel driving and driven gears l ii'and l4 see Fi'g-. 5) is a rotatable hub I 5; which projects. outwardly from the face of. the standard H, and upon'which a circular cutting-blade f6 is mounted; so asto be revolved thereby w en: the machine is in operation. The blade F8 is held tothe hub by a keeper ring M, which is screwed onto an externally threaded 10058 It which projects outwardly and axially frofiisaidi hub. The lower segment" of the cutting edge portion of the" mounted blade I'6 extends below the top of the base l0, and passes through a slotted throat l5 which is fixed upon the baseirr front of the bl'ade' Hi. The machine ismanipulated by a handle 20, which projects rearwardly from the'upper part of the standard Hi. Depending from the forward upper part of the standard I! is a combined blade guard and presser foot 24', which; aste its presser footfunction, holds'down thepile of cloththrough which the revolving blade I6 is moved during operation of the machine, SO-that the cloth islifted by or rides' up over the throat I S into engagement with the blade cutting" edge. Als'o suitably supported fromthe forward part of'the' standard H above and ifif-Ijohfiof the'bl'ad'e I-6,-are a pair of'grindf stones 22-" vv'liich, whenuse thereofisrequired, may be swung downward intofeiiga'ger'nent with therevolving Cutting edge ofth' bla de forthe purposeof reshai pen-ing such edge.

It'- is common practice tdfor'm the driving hub we in a non-symmetrical per pheral shape, and to provide the blade l6 witha central aperture of correspondingnon-symmetrical peripheral shape; so thatthe blade can be properly mounted upon the hub" I5 in only one way, i. e; with its fiat side or facelii' inward and opposed closely adjacent to' the face of the standard H, and with its beveled side or face 16 outwardly presented'; this being done for reasons'alread'y above referred to,

Thefb'l'ade' adapter devicepaccordingf to this invention, comprises a perforate disk' ZS of v -ri'gid material, such as steel or other suitable metal, or

view of the f of hard and rigid non-metallic material. Said disk approximates in thickness the major thickness'of the central body portion of a blade [6 in which the blade aperture 23 is formed, and is preferably not in excess of the latter thickness. Said disk 25 is provided with an external nonsymmetrical peripheral shape 26 corresponding to and adapted to non-rotatably fit within the non-symmetricaldriving hub embracing aperture 23 of a blade from a relatively large size clothcutting machine. Said disk 25 is further provided with an internal non-symmetrical peripheral shape 2] corresponding to and adapted to non-rotatabl'y embrace a non-symmetrical driv- I mg hut of a comparatively smaller size clothcutting machine.

When a blade [6 of a relatively large size cloth cuttingmachine has been ground down by-required sharpening thereof from timejto time, whereby its diameter is reduced to an extent which no longer permits its cutting; edge'to properly and suflicien'tly enter the slotted throat 19 of the machine, e. g. to a circumference of reduced; diameter approximating. that indicated by dot; and dashbrokenline in. Fig; 1, said blade .is no longer capable of satisfactory use in such machine, 'and, so far as the latter is concerned; must be discarded and replaced by a new blade of initial maximum diameter;

Although no longer useful in the relatively large size machine,zthe worn and discarded blade nevertheless is capable of prolonged-useful life provided it can be-mounted' in asmaller size machine, Such prolonged life, with the attendant advantages already referred: to, maybe easily attained by the-use of the perforate adapterfdisk 25 0f this invention. To this-end, said adapter disk 25 is inserted; within the driving hub embracing aperture 23 of. the discarded blade f6, and since the external. peripheral shape 26of said adapter disk corresponds in size and conformationto the non-symmetrical shape of the blade aperture 23, said diskwill fit snugly within the latter; and will so interlock therewith as to be non-rotatable therein, and consequently will be efficiently capable, when rotated; of transmitting its rotary movement/to. the blade I6 to which'it is thus applied. Since the central opening of the adapter disk is" provided with a peripheral shape which corresponds in size and conformation to the non-symmetrical driving hub of a smaller size machine, the: blade I6 with the adapter disk assembled therewith may be applied upon and so as'to fittinglyembrace thelatter driving hub in interlocked relation thereto, and so as to receive rotary motion therefrom, as" shown 'in-" Fig-, 5, whereupon the blade and adapterassembly may be secured insuch operatively mounted relation by means of a keeper ring 11-, as-also shown in d Fig. 5. In the use of the adapter device, all the advantage of making it impossible to mount the adapter blade in a smaller size machine any other way than a properone is retained by the described adapter construction;

From the above it will be obvious-that a blade l6 discarded from a relativelylarge size machine may be easily adapted to and used in a smaller size machine, and thereby a prolonged lease of useful life for the otherwise wasted blademate I rial is attained.

Having now set forth my invention and its advantages,v I claim.:

we 1. A device for the purposes described com}.- I prising an adapter in the form of a perforate I disk of rigid material having a non-symmetrical external peripheral shape corresponding to and adapted to non-rotatably fit Within the driving hub embracing aperture of a rotary blade discarded from a relatively large size cloth-cutting machine, and a non-symmetrical internal peripheral shape corresponding to and adapted to non-rotatably embrace a driving hub of a smaller size cloth-cutting machine.

2. A device for the purposes described com-,

prising an adapter in the form of a perforate disk of rigid material having a non-symmetrical externalperipheral shape corresponding to and adapted to non-rotatably fit withinthe driving hub'embracing aperture of a rotaryblade discarded from a relatively large size cloth-cutting machine, and a non-symmetrical internal peripheral shape corresponding to and adapted to non-rotatably embrace a driving hub of a smaller size cloth-cutting machine said disk being of a' embrace a non-symmetrical driving hubof a smaller size cloth-cutting machine.

4. A device for the purposes described comprising an adapter in the form of a flat disk ofrigid material having a non-symmetrical peripheral edgecorresponding to and adapted to interlockingly fit Within a non-symmetrical driving hub embracing aperture of a rotary blade discarded from a relatively large size cloth-cutting machine, said disk having a central opening of non-symmetrical peripheral contour conform,- able .to and adapted to interlockingly embrace a non-symmetrical driving hub of a smaller size cloth-cutting machine, said disk being of a thickness approximating that of the apertured body portion 'of said blade. I v l 5. A device for the purposes described comprising an adapter in the form of a fiat disk of rigid material having a non-symmetrical peripheral edge corresponding to and adapted to int'erlockingly fit within a non-symmetrical driving hub embracing aperture of'a rotary blade discarded from a relatively large size cloth-cutting machine, said disk having a central opening of non-symmetrical peripheral contour conformable to and adapted to interlockingly embrace a non-symmetrical driving hub of a smaller size cloth-cutting machine, said disk being of a thickness not in excess of that of the apertured body portion of said blade.

WILLIAM AARON. 

